If you're looking for a running vest for long runs or races that approach 15 hours or more, this Compressport ULTRUN S PACK EVO 15 running vest is one you can always rely on. With its three zipper pockets and 12+3 liter capacity, this ultra-stable running vest gives you plenty of room for nutrition and gear for long adventures and ultramarathons. The lower half has an opening for tubing. The pockets on the back are elasticated, so you can easily fit the mandatory clothing and equipment. In addition, a rubber "Z" system is designed on the outside of the backpack where you can attach a jacket or raincoat. At the bottom of the back there are two opposite pockets. Each of them is accessible only from one side. You can practically separate things inside this double pocket. Rubber eyelets with internal silicone print are there ready for your folded poles.